"It was a really nice day for me," hesaid. "I was hitting it really well. I wasn't making enough putts in the early round but at the end I made some 15-footers and 25-footers."
Lee had missed six straight cuts before he earned US$378,000 ($446,000) for his work in Puerto Rico, a tournament he said sparked a resurgence in his game.
" I was starting to act more positive, I was believing in every shot I hit and I was believing in my game.
"I know I can do this and that attitude changed me. It changed my game quite a lot, I think."
Fellow Kiwi Tim Wilkinson was sitting on one-over in a tie for 70th when play was suspended due to darkness, while on the Japan Tour Gareth Paddison shot eight-under to take a first round lead at the Indonesia Championship.
Ko trails leaders Paula Creamer and Mariajo Uribe by seven shots.